Sky lanterns part 2

We had another go at the Sky Lantern thing last night, with mixed success. Well, no success really. The 140l bags were a massive improvement on the 36l ones we'd used previously. The frame we used would, in principle, be liftable by that sort of volume of hot air, but could be lighter - lighter is always better. At one point I got brave and let go to see what would happen. The thing went sideways for a bit, but never really went upwards. I'm hoping that the next time there's a flat calm we can give it another go with a bit more success, but I'm keeping an eye out for alternative frame materials in the meantime. Here's a few photos.





And here's a video: